96 80 Series Cruiser low beam won't turn off

Was on Fraser Island last week driving down the beach late afternoon, got back in camp turned off lights but the low beam stayed on, disconnected the wiring at the lights, got off the island for the drive home plugged the lights back in and still the same problems, had to disconnect low beam at sealed beams lights.
The high beam still goes up and down but the driving lights now have to be switched independently, before I could switch on and use with high beam and driving lights together or independently.
I know the car is fitted with auto lights as I have left the lights on and they turn off automatically after the key is removed.
Any advice much appreciated
Rod